Ruby check if something is mounted(--bind) in this directory

mount
    /project on /mount_1 type none (rw,bind)
    /project on /mount_2 type none (rw,bind)
    /project on /mount_3 type none (rw,bind)

How to check with ruby(not shell!!开发者_JAVA百科) whether some dir is mounted on /mount_X?

Is there something easier than opening /proc/mounts and looking for /mount_X there?

Another way to do it is:

system("mount|grep /mount_X")

As long as you are under linux, you find many answers directly by reading from the filesystem:

File.open('/proc/mounts').each do |line|
  device, mount_point, file_system_type, mount_options, dump, fsck_order  = line.split(" ")
end

which leads to the following solution for your problem:

if File.readlines('/proc/mounts').any?{ |line| line.split(" ")[1] == "/mount_X"}
    puts "Yes, it is mounted!!!"
end

You can just parse the output of the mount command:

`mount`.split("\n").grep(/bind/).map { |x| x.split(" ")[2]  }

a little twist to @tvw's answer did it for me. Read /proc/mounts line by line and do a partial string match on the mountpoint full path mountpoint/folder_name .

 raise "Failed:  not mounted" 
 unless File.readlines('/proc/mounts').any?{ |line| line.split(" ")[1] =~ /folder_name$/ }